Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1822480 times)

xrunner, Kosmic, scl, Neomys Sapiens, URI, factory, malagas_on_fire, Echo88, mansaxel, tggzzz, EV and 18 Guests are viewing this topic.

Offline med6753

  • Super Contributor
  • ***
  • Posts: 4036
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6900 on: February 03, 2018, 12:19:57 pm »
The Fluke 8800A arrived yesterday in one piece. The seller did an excellent job with the packaging. It was in a large box surrounded by peanuts plus the unit itself was bubble wrapped. I didn't fully appreciate how much larger an 8800A is compared to a typical 8000A or 8600A in both height and length. And it's heavy! When I got it the cover off it became very clear. This thing is built like a brick shithouse. Metal covers top and bottom plus an all metal chassis. That's the good news.

The bad news is that it powers up but that's about it. The display flashes random numbers. None of the functions work. And certain switch positions cause the power transformer to start screeching. Clearly we have some major problems. I did some initial checks of the power supply and all voltages are good except the +35V source. It's reading +25V so something is loading it down. This unit is loaded with tants so I think my approach right now is inventory all of them and do a mass replace plus do the filter caps too. Then assess where I'm at and take it from there. Anyone aware of any other areas to check? I know the reed relays and the front switch panel can be problem areas so I'll be checking that. I'm also going to contact the seller. I'll praise him for his packaging but see if he's willing to do a partial refund. I have no intention of sending it back. One way or another I'm going to fix it.     
« Last Edit: February 03, 2018, 03:38:17 pm by med6753 »
An old gray beard with an attitude.
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11600
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6901 on: February 03, 2018, 12:30:00 pm »
Those reed relays are dicks. I had an open circuit one in my 8600A. Same type. Replaced it with a bog standard part bodged in with thick wire and glued upside down to the board. Filter caps and tants were shot in that one too. Also one to look out for is the pass transistors. Not sure if they use a fully discrete power supply in that (looks like it) but they lose beta after being cooked for a couple of decades so it causes the rails to sag significantly. Those Philips electrolytics are known problematic as well. Nothing but trouble.

Hopefully not the ASIC gone. If that's done, keep it for parts and see if you can find another one

Edit: at least it hasn't got that stupid bendy pcb that the 8000A has in it!
« Last Edit: February 03, 2018, 12:36:03 pm by bd139 »
 

Offline med6753

  • Super Contributor
  • ***
  • Posts: 4036
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6902 on: February 03, 2018, 12:39:29 pm »
Those reed relays are dicks. I had an open circuit one in my 8600A. Same type. Replaced it with a bog standard part bodged in with thick wire and glued upside down to the board. Filter caps and tants were shot in that one too. Also one to look out for is the pass transistors. Not sure if they use a fully discrete power supply in that (looks like it) but they lose beta after being cooked for a couple of decades so it causes the rails to sag significantly. Those Philips electrolytics are known problematic as well. Nothing but trouble.

Hopefully not the ASIC gone. If that's done, keep it for parts and see if you can find another one

Edit: at least it hasn't got that stupid bendy pcb that the 8000A has in it!

Yep, I also have an 8600A and so far no issues with the reed relays. And it has the original tants and filter caps too. I know I should replace them but it's working fine and it's calibration is spot on. "If it ain't broke, don't fix it mentality" I guess.

Edit: Re: the 8000A bendy PCB. It sure does. And believe it or not the 8010A and 8050A have the same flimsy construction. And of all my Fluke bench DMM's the 8000A is the most finicky and drifty. It needs a good 1 to 1.5 hours to stabilize. I think it's due to the lame power supply. The +5V has absolutely no regulation. I did replace all the filter caps but it didn't really help all that much. 
« Last Edit: February 03, 2018, 12:57:52 pm by med6753 »
An old gray beard with an attitude.
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11600
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6903 on: February 03, 2018, 12:55:17 pm »
I certainly wouldn’t fix it if it wasn’t broken. Boards are quite fragile in early fluke stuff.
 

Offline med6753

  • Super Contributor
  • ***
  • Posts: 4036
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6904 on: February 03, 2018, 03:28:50 pm »
Sometimes you win. I sent a message to seller concerning this non-functional Fluke 8800A. I paid $69.95 USD plus shipping. He's giving me a $60 USD refund. Much more than I expected.  :-+
An old gray beard with an attitude.
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11600
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6905 on: February 03, 2018, 03:34:27 pm »
That’s pretty awesome  :-+

Now you’ll find it’s a ten cent tantalum and you’ll be sorted :D
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 7424
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6906 on: February 03, 2018, 03:41:27 pm »
Agreed. The amount of decent scrap that came out of that era was amazing. I could get stuff I needed out of charity shops, car boot sales and jumble sales. Buying it new now from China is most economical. I have actually considered joining BVWS because of their auctions ( https://www.bvws.org.uk/ ) just to get a look in on all that again. Check the ending prices of some of the stuff on their web site. Auctions are at Harpenden as well which isn't a big trek. Lots of test gear appears in there.

Talking of shitty transistor radios, I saw this on ebay and couldn't resist: https://www.ebay.co.uk/itm/181871312895 - going to build it, then add a BFO and see if I can bend it to top band so I can tune into the comedy bitching on 1933KHz from the "gentlemen of 1933".

Car I always wanted was the Rover SD1. This desire has only recently been replaced by Gene Hunt's Audi Quattro  :-DD

Yep, I've been thinking about joining the BVWS as well for the auctions and swap meets buts as far as I got so far thinking about it.
Who let Murphy in?
 

Online beanflying

  • Super Contributor
  • ***
  • Posts: 3705
  • Country: au
  • Toys so very many Toys.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6907 on: February 03, 2018, 04:04:43 pm »
2.45am post purchase endorphin rush kicking in ........ Sleep unlikely maybe I should look at a sniper program after all  :palm:

Wonder if counting DMM's will help  :=\
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 4891
  • Country: us
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6908 on: February 03, 2018, 09:39:01 pm »
If counting doesn't work, you could just drop that anvil on your head...  :-DD


mnem
"... and four... count 'em, FOUR! Convenient carry handles for your pleasure..."
 

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 4891
  • Country: us
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6909 on: February 03, 2018, 09:43:33 pm »
Agreed. The amount of decent scrap that came out of that era was amazing. I could get stuff I needed out of charity shops, car boot sales and jumble sales. Buying it new now from China is most economical. I have actually considered joining BVWS because of their auctions ( https://www.bvws.org.uk/ ) just to get a look in on all that again. Check the ending prices of some of the stuff on their web site. Auctions are at Harpenden as well which isn't a big trek. Lots of test gear appears in there.

Talking of shitty transistor radios, I saw this on ebay and couldn't resist: https://www.ebay.co.uk/itm/181871312895 - going to build it, then add a BFO and see if I can bend it to top band so I can tune into the comedy bitching on 1933KHz from the "gentlemen of 1933".

Car I always wanted was the Rover SD1. This desire has only recently been replaced by Gene Hunt's Audi Quattro  :-DD

Yep, I've been thinking about joining the BVWS as well for the auctions and swap meets buts as far as I got so far thinking about it.

hmmm... just checked 'em out.

Looks like they're having a big auction on the 11th; over 400 lots. If you can't find the love of your life... err, the perfect boat anchor THERE, you aren't trying.  :-DD


mnem
Woops... kids are calling. Time for Captain Underpants to the rescue...
 

Online beanflying

  • Super Contributor
  • ***
  • Posts: 3705
  • Country: au
  • Toys so very many Toys.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6910 on: February 03, 2018, 11:15:20 pm »
I am suspecting the 'carry handles' are cosmetic rather than working devices  ;D

Deciding between a second 11RU server case or a 47RU for expansion  :-DD

3rd coffee is helping......
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline bitseeker

  • Super Contributor
  • ***
  • Posts: 7888
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6911 on: February 04, 2018, 02:29:05 am »
So in a moment of weakness I bought this EDC 501j off of ebay. It was listed as for parts so I took a gamble. Seems to have paid off  :scared:.

That looks familiar. Nice catch! The binary front panel enables you to go beyond the "legal" values of the regular version.
I TEA.
 

Offline bitseeker

  • Super Contributor
  • ***
  • Posts: 7888
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6912 on: February 04, 2018, 02:36:04 am »
2.45am post purchase endorphin rush kicking in ........ Sleep unlikely maybe I should look at a sniper program after all  :palm:

That's a beauty!

Quote
Wonder if counting DMM's will help  :=\

If not, surely you can count all the other equipment, too. ;D
I TEA.
 

Online xrunner

  • Super Contributor
  • ***
  • Posts: 4164
  • Country: us
  • hp>Agilent>Keysight>?
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6913 on: February 04, 2018, 02:46:42 am »
Vintage arcade game for TEA  ;D

I like the small yellow area between the red "Replace" ad the green "Good". Would you really go home with your tube if it landed in the yellow LOL.  :-//
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 7424
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6914 on: February 04, 2018, 03:13:29 am »
Vintage arcade game for TEA  ;D

I like the small yellow area between the red "Replace" ad the green "Good". Would you really go home with your tube if it landed in the yellow LOL.  :-//
Come to that would go home with your tube if was anywhere near the red?
Who let Murphy in?
 

Offline Specmaster

  • Super Contributor
  • ***
  • Posts: 7424
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6915 on: February 04, 2018, 03:30:04 am »
At last all the bits have arrived on that slow boat from China and now my Heathkit V-7AU is totally battery free and can now also use the same jacks and leads for both AC and DC volts, in other words, use it as a normal analogue multimeter but with the advantage of an input impedance similar to that of a DMM but can also be used as centre zero meter for radio alignment.

The DC jack has been replaced with a dedicated 6v LED so now the case and chassis is completely floating and isolated, thus allowing the use without having to keep swapping jacks and leads.  :-+

Who let Murphy in?
 

Online beanflying

  • Super Contributor
  • ***
  • Posts: 3705
  • Country: au
  • Toys so very many Toys.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6916 on: February 04, 2018, 05:49:58 am »
I have a very vague memory of riding my single speed bike to the local electrical wholesalers almost 40 years ago to pick up a roll of multicore (branded) .8mm. The Dr Pat tin under it contains the spares for the uber crusty soldering iron of a few weeks back.

For a dare should I fix the HP counter LED's with them  :-DD
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline bitseeker

  • Super Contributor
  • ***
  • Posts: 7888
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6917 on: February 04, 2018, 06:19:21 am »
Crusty iron, crusty tips, and crusty solder with crusty flux core. Hmm, maybe save it for a really crusty repair. ;D
I TEA.
 

Offline MasterTech

  • Frequent Contributor
  • **
  • Posts: 879
  • Country: 00
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6918 on: February 04, 2018, 08:01:22 am »
Vintage arcade game for TEA  ;D
Instadivorce version Tube tester for TEA members  >:D

Mr Carlson would drool with that one, can even picture him  ;D
 

Online tggzzz

  • Super Contributor
  • ***
  • Posts: 9884
  • Country: gb
    • Having fun doing more, with less
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6919 on: February 04, 2018, 08:57:06 am »
I have a very vague memory of riding my single speed bike to the local electrical wholesalers almost 40 years ago to pick up a roll of multicore (branded) .8mm. The Dr Pat tin under it contains the spares for the uber crusty soldering iron of a few weeks back.

I still use my wirewrap wire from ~1978, albeit not for wirewrap. (Actually, I did recently create a wirewrap scope timebase calibrator from similar vintage 74LS TTL, and use it to demonstrate the necessity of a good groundplane).

I also have my working homebrew digital clock (the first most people had seen) from 1973, but that used "other" techniques.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 

Offline neo

  • Super Contributor
  • ***
  • Posts: 1696
  • Country: us
  • The specialist.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6920 on: February 04, 2018, 09:20:50 am »
I have a very vague memory of riding my single speed bike to the local electrical wholesalers almost 40 years ago to pick up a roll of multicore (branded) .8mm. The Dr Pat tin under it contains the spares for the uber crusty soldering iron of a few weeks back.

I still use my wirewrap wire from ~1978, albeit not for wirewrap. (Actually, I did recently create a wirewrap scope timebase calibrator from similar vintage 74LS TTL, and use it to demonstrate the necessity of a good groundplane).

I also have my working homebrew digital clock (the first most people had seen) from 1973, but that used "other" techniques.

Building clocks is my favorite thing to do, perhaps because its what i did first.
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11600
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6921 on: February 04, 2018, 09:25:13 am »
I think it’s a right of passage. I too built a clock about 1989.  Was a 4000 logic based device. Probably still in my parents’ loft. Was on SRBP matrix board from Tandy and wired using wire nicked off a BT engineer while he was packing up his stripey tent.

Edit: remember I was quite poor so I learned how to use diodes to reset the counters instead of combo logic. Then I discovered that this was actually a proper way of doing things.
« Last Edit: February 04, 2018, 09:27:07 am by bd139 »
 

Offline neo

  • Super Contributor
  • ***
  • Posts: 1696
  • Country: us
  • The specialist.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6922 on: February 04, 2018, 09:30:56 am »
Clocks to me is what pushes me ever deeper, my first was a 4000 series clock and i made it do a trick that Dave (ALL HAIL OUR OVERLORD!) even said couldn't be done.

My current one is a hundred chip version using a muxed display, it comes complete (maybe, still working) with an alarm and a radio.  :popcorn:

Edit: Post 1111, make a wish! (old joke/superstition)
« Last Edit: February 04, 2018, 09:33:14 am by neo »
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 16013
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6923 on: February 04, 2018, 09:38:01 am »
I think it’s a right of passage. I too built a clock about 1989.  Was a 4000 logic based device. Probably still in my parents’ loft. Was on SRBP matrix board from Tandy and wired using wire nicked off a BT engineer while he was packing up his stripey tent.
:-DD
Our line used to be soooo bad we got to know the NZ Post Office Telecom Chorus techs by their first names they were here so often.  ::)
Never knicked anything off them, instead got chatting about their work and my interest in electronics. Crimp connectors, rolls of hookup cable, spare phones, free house phone wiring upgrades, offcuts of 15/25/50 pair underground cable all came our way for the cost of the occasional cuppa.  :)
The kids high-school electronics teacher though we were great guys sending in lengths of dry-core cable (not modern grease filled muck) for classroom breadboard jumpers. The old stuff was best as it was a heavier gauge.  ;)

Those days are over.......gone VOIP with our new 5 GHz microwave link.
Avid Rabid Hobbyist
 
The following users thanked this post: SeanB

Online tggzzz

  • Super Contributor
  • ***
  • Posts: 9884
  • Country: gb
    • Having fun doing more, with less
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #6924 on: February 04, 2018, 09:39:46 am »
I think it’s a right of passage. I too built a clock about 1989.  Was a 4000 logic based device. Probably still in my parents’ loft. Was on SRBP matrix board from Tandy and wired using wire nicked off a BT engineer while he was packing up his stripey tent.

I still use hookup wire that my brother got from the installation of the new London Air Traffic Control Center in West Drayton (not Swanwick). I also had a trip to the control tower in Heathrow, including into the main control room with tinted glass; I had to be careful not to knock any switches. (Back then I also sauntered along Downing St as a shortcut).

I have some of the "last mile" underground wires recently replaced by BT. They are twisted pair enamelled wires, insulated with wrapped on wax paper, and the whole lot enclosed in lead sheath.

I've also seen mains wiring where the earth connection was a lead sheath! I've also seen some which was singly insulated, with the individual wires laid in the channels of a wooden E-section.

Quote
Edit: remember I was quite poor so I learned how to use diodes to reset the counters instead of combo logic. Then I discovered that this was actually a proper way of doing things.

I built an 8-bit counter to turn my battery powered radio off after a variable delay, because batteries were expensive. It used scavenged discrete components for the flip-flops. Since I couldn't get enough of the same value capacitors (some waxed, ugh), I had to tweak the resistors until each bit worked.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf